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For those who study materials science, the name \"martensite\" is well-known; but how many people know about Adolf Martens? In fact, the “Ma” in martensite refers to him. There are many other microstructures in iron-carbon alloys that are named after people. Today, we will talk about these names and the stories of the pioneering materials scientists behind them. Martensite, as mentioned earlier, is named after Adolf Martens (1850–1914). This gentleman, known as Mardens or Martens, is a German metallurgist. In his early years, he worked as an engineer on the construction of railway bridges and came into contact with the emerging methods of material testing. Thus, he used a self-made microscope to observe the metallographic structure of iron, and in 1878 published \"Microscopic Studies of Iron,\" in which he described the morphology of metal fractures as well as their metallographic structure after polishing and acid treatment. (It seems like we’re doing quite a lot of this kind of work right now.) ) He observed that the structural arrangement of pig iron during cooling and crystallization was very regular (with martensite being one of the components), and predicted that microscopic analysis would surely become one of the most useful methods for such studies (showing great foresight). He also served as director of the Institute of Mechanical Engineering attached to the Royal University of Berlin, which was the predecessor of the Berlin Royal Materials Testing Institute (‘Staatliche Materialprüfungsamt’); there he established a first-class metallographic laboratory. The International Society for Testing and Materials was established in 1895, and he served as its vice president. To this day, there is still a highly prestigious award in Germany named after him. Now, talking about austenite: as put it by someone whose nickname is Austenite, whom I came across by chance, austenite is called that not because its discoverer liked the works of Jane Austen, nor because of Austin, the capital of Texas, but because of a metallurgist from Britain named Sir William Chandler Roberts-Austen (1843–1902). My guess is that his name was probably Roberts-Austin, and he was titled Sir William Chadler. This jazz musician truly has many talents. He was the first to create an iron-carbon phase diagram; the preliminary version was completed in 1897 and the final version was finished in 1899. He was also the first person to verify Fick’s law of diffusion through quantitative experiments, using experiments on the diffusion of gold in platinum. He, along with Lefebvre in France, is also regarded as one of the pioneers of differential thermal analysis. Next, let’s take a look at the life of this gentleman. Roberts-Austin was born on March 3, 1843, in Kennington, England. At the age of 18, he entered the Royal School of Mines. Later, he worked in a mint, conducting research on the composition of gold, silver, and alloys. He determined the freezing point of silver-copper alloys using the calorimetric method, and first represented his experimental results with a freezing point curve. Elected a member of the Royal Society of London in 1875. In 1876, he used a spectrometer for quantitative analysis together with J. Lockyer to complement traditional assaying methods. In 1885, he began studying the strengthening of steel; at the same time, he investigated the effect of small amounts of impurities on the tensile strength of gold, and discussed this in a paper published in 1888, which became an early example of using the periodic table to explain the properties of various elements. Austin used a Pt/(Pt-Rh) thermocouple pyrometer to measure the cooling rate of high-melting-point substances and established the eutectic theory. He used microscopic photography to study the metallographic morphology of metals. His work at the mint made him a world-renowned authority on coinage. From 1882 to 1902, he was a professor of metallurgy at the Royal School of Mines in London, and was granted a knighthood in 1899. Passed away on November 22, 1902. Bainite: In comparison, we know much less about the “namesake” of bainite and ledeburite. Bainite, named after the American chemist E. C. Bain, was discovered in the 1930s by him and his colleagues during experiments on \"isothermal transformation curves\" – experiments they conducted for the first time. They found a new type of structure that differed from those they were familiar with; this needle-like or feather-like structure was later named after him. Ledeburite, named after Adolf Ledebur (1837–1916). All we know about him is that he was the first professor of ’Eisenhüttenkunde’ at the Bergakademie Freiberg, and he became famous for discovering iron-carbon ’Mischkristalle’ in 1882; those German terms mean something, so I would be grateful if experts could explain them to me. Organizations named after people are generally like this; the naming of other organizations varies. Ferrite, named after the Latin word for iron (Ferrum) ； Pearlite, named for its pearl-like luster ； Cementite, on the other hand, was named so because its discoverer referred to it as \"cement\" (in French, Ciment) to describe its role in binding together the first crystals that form during the solidification process.